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Vulnerability details: VCID-1cv7-q2cn-byh6
Vulnerability ID VCID-1cv7-q2cn-byh6
Aliases CVE-2019-10010
GHSA-3v43-877x-qgmq
Summary Cross-site Scripting Cross-site scripting (XSS) vulnerability in the PHP League CommonMark library allows remote attackers to insert unsafe links into HTML by using double-encoded HTML entities that are not properly escaped during rendering, a different vulnerability than CVE-2018-20583.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.00326 https://api.first.org/data/v1/epss?cve=CVE-2019-10010
cvssv3.1 6.1 https://github.com/advisories/GHSA-3v43-877x-qgmq
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-3v43-877x-qgmq
generic_textual MODERATE https://github.com/advisories/GHSA-3v43-877x-qgmq
cvssv3.1 6.1 https://github.com/FriendsOfPHP/security-advisories/blob/master/league/commonmark/CVE-2019-10010.yaml
generic_textual MODERATE https://github.com/FriendsOfPHP/security-advisories/blob/master/league/commonmark/CVE-2019-10010.yaml
cvssv3.1 6.1 https://github.com/thephpleague/commonmark
generic_textual MODERATE https://github.com/thephpleague/commonmark
cvssv3.1 6.1 https://github.com/thephpleague/commonmark/issues/353
generic_textual MODERATE https://github.com/thephpleague/commonmark/issues/353
cvssv3.1 6.1 https://github.com/thephpleague/commonmark/releases/tag/0.18.3
generic_textual MODERATE https://github.com/thephpleague/commonmark/releases/tag/0.18.3
cvssv3.1 6.1 https://github.com/thephpleague/commonmark/security/advisories/GHSA-3v43-877x-qgmq
cvssv3.1_qr MODERATE https://github.com/thephpleague/commonmark/security/advisories/GHSA-3v43-877x-qgmq
generic_textual MODERATE https://github.com/thephpleague/commonmark/security/advisories/GHSA-3v43-877x-qgmq
cvssv3.1 6.1 https://nvd.nist.gov/vuln/detail/CVE-2019-10010
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2019-10010
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2019-10010
https://github.com/thephpleague/commonmark
https://github.com/thephpleague/commonmark/issues/353
https://github.com/thephpleague/commonmark/releases/tag/0.18.3
CVE-2019-10010 https://nvd.nist.gov/vuln/detail/CVE-2019-10010
CVE-2019-10010.YAML https://github.com/FriendsOfPHP/security-advisories/blob/master/league/commonmark/CVE-2019-10010.yaml
GHSA-3v43-877x-qgmq https://github.com/advisories/GHSA-3v43-877x-qgmq
GHSA-3v43-877x-qgmq https://github.com/thephpleague/commonmark/security/advisories/GHSA-3v43-877x-qgmq
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://github.com/advisories/GHSA-3v43-877x-qgmq
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://github.com/FriendsOfPHP/security-advisories/blob/master/league/commonmark/CVE-2019-10010.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://github.com/thephpleague/commonmark
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://github.com/thephpleague/commonmark/issues/353
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://github.com/thephpleague/commonmark/releases/tag/0.18.3
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://github.com/thephpleague/commonmark/security/advisories/GHSA-3v43-877x-qgmq
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2019-10010
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.55842
EPSS Score 0.00326
Published At May 30, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-05-30T20:54:54.833374+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/packagist/league/commonmark/CVE-2019-10010.yml 38.6.0